Buick LaCrosse II facelift (2013-2016) (on rear wheel well) Wiring diagrams

1 2 SERIAL DATA (-) SERIAL DATA (+) 8 7 6 5 4 3 2 1 BATT POS VOLT GROUND BLK WIRE BLU WIRE BLU/YEL WIRE COMPUTER DATA LINES SYSTEM DRIVER INFORMATION CENTER DISPLAY DRIVER OUTSIDE REARVIEW MIRROR DRIVER SIDE OBJECT DETECTION INDICATOR DRIVER OUTSIDE REARVIEW MIRROR GLASS GRN WIRE GROUND DISTRIBUTION SYSTEM GRY WIRE GRY/VIO WIRE GRY/YEL WIRE HOT AT ALL TIMES INSTRUMENT CLUSTER LED SIGNAL LEFT SIDE OBJECT SENSOR (BEHIND LEFT REAR WHEEL) LOGIC OBST DETCT FUSE PASSENGER OUTSIDE REARVIEW MIRROR RED/GRN WIRE RIGHT SIDE OBJECT SENSOR (BEHIND RIGHT REAR WHEEL) SERIAL DATA (-) SERIAL DATA (+) ENABLE 2 SERIAL DATA (-) SERIAL DATA (+) ENABLE 2 DET LED SIG LED SIGNAL UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY) WHT/GRN WIRE YEL WIRE YEL/VIO WIRE

3 4 BATT POS VOLT BATT POS VOLT 4 17 5 BATT POS VOLT IND DIM CTRL HAZ LED 7 13 TRUNK LP CTRL INADVERTENT PWR CTRL BCM 7 BCM 2 FUSE BLOCK FUSE FUSE (LOWER LEFT SIDE OF DASH) BLK WIRE BODY CONTROL MODULE (LEFT SIDE OF DASH) CENTER CONSOLE COMPARTMENT LAMP CENTER CONSOLE COMPARTMENT LAMP SWITCH COMPUTER DATA LINES SYSTEM CRUISE CONTROL, SOUND SYSTEMS DIM SIG LED AMBIENT LIGHTING CTRL DIMMER SWITCH DRIVER DOOR COURTESY FOG LAMP SWITCH FUSE 32 GRN/GRY WIRE GROUND DISTRIBUTION SYSTEM GRY WIRE GRY/GRN WIRE GRY/LT GRN WIRE HEADLAMP SWITCH HOT AT ALL TIMES INSTRUMENT PANEL INSTRUMENT PANEL COMPARTMENT LAMP INTR LP CTRL INTR LP DEFEAT SW SIG COURTESY LP SW SIG PUDDLE LAMP SUPLY VOLT 19 8 LAMP LEFT REAR DOOR COURTESY LEFT SUNSHADE LEFT SUNSHADE MIRROR LAMP LEFT TAILLAMP ASSEMBLY LIFT GATE AJAR SW SIG LIGHTING CTRL SW SIG LIGHTING CTRL SW REF LT GRN/GRY WIRE LT GRN/YEL WIRE NCA WIRE NETWORK BUS 3 NETWORK BUS 4 PASSENGER DOOR COURTESY REAR COMPARTMENT COURTESY LAMP REAR COMPARTMENT LID LATCH (IN TRUNK LID) RED/BRN WIRE RED/DK GRN WIRE RED/WHT WIRE RIGHT REAR DOOR COURTESY RIGHT SUNSHADE RIGHT SUNSHADE MIRROR LAMP UNDER HOOD FUSE BLOCK (LEFT SIDE OF BATTERY) VIO WIRE VIO/BRN WIRE VIO/GRY WIRE W/ CUSTOM INTERIOR PACKAGE LAMP WHT WIRE WHT/BRN WIRE WHT/YEL WIRE YEL WIRE

BLK WIRE CIRCUIT COURTESY LAMP DOME LAMP SWITCH DRIVER OUTSIDE REARVIEW MIRROR DRIVER OUTSIDE REARVIEW MIRROR COURTESY LAMP DRIVER OUTSIDE REARVIEW MIRROR LAMP ASSEMBLY GROUND DISTRIBUTION SYSTEM GRY WIRE GRY/GRN WIRE GRY/LT GRN WIRE INSTRUMENT ILLUMINATION INSTRUMENT ILLUMINATION CIRCUIT INSTRUMENT PANEL MULTI-FUNCTION SWITCH 2 LEFT FRONT DOME/ READING LAMPS LEFT TAILLAMP ASSEMBLY LT GRN/BRN WIRE ORG/BLK WIRE PASSENGER OUTSIDE REARVIEW MIRROR PASSENGER OUTSIDE REARVIEW MIRROR COURTESY LAMP PASSENGER OUTSIDE REARVIEW MIRROR LAMP ASSEMBLY REAR DOME/READING LAMPS REAR PARKING ASSIST CONTROL MODULE (CENTER OF REAR PACKAGE SHELF) RIGHT FRONT DOME/ READING LAMPS RIGHT INSTRUMENT PANEL SPLICE PACK W/ CUSTOM INTERIOR PACKAGE LAMP WHT WIRE WHT/BRN WIRE WHT/YEL WIRE YEL WIRE

4 2 1 ACTR SPLY VOLT ACTR TRANSMIT SIG ACTR RTN ACTR RECEIVE SIG AJAR SW SIG BLK WIRE BRN/WHT WIRE BRN/YEL WIRE CHILD SECURITY LOCK DISABLE RELAY COMPUTER DATA LINES SYSTEM DK BLU WIRE DRIVER INFORMATION SECURITY CENTER IND DISPLAY FROM BREAKOUT TO WINDOW MOTOR) GMLAN SERIAL DATA LOGIC GRN/GRY WIRE GRN/YEL WIRE GRY WIRE GRY/BLK WIRE GRY/LT GRN WIRE INSTRUMENT CLUSTER KEYLESS ENTRY ANTENNA LEFT REAR DOOR LATCH ASSEMBLY LEFT REAR WINDOW SWITCH LT GRN/GRY WIRE NETWORK BUS 3 NETWORK BUS 4 PASSENGER WINDOW MOTOR (FRONT PASSENGER'S DOOR) RECEIVER (ON PASSENGER SIDE C-PILLAR) REMOTE CONTROL DOOR LOCK RIGHT REAR DOOR LATCH ASSEMBLY RIGHT REAR WINDOW SWITCH TO REAR OF VEHICLE) VIO/GRY WIRE VIO/YEL WIRE WHT/BLU WIRE WHT/DK BLU WIRE WHT/GRN WIRE YEL WIRE

ACCESSORY VOLTAGE AJAR SW SIG AMBIENT LIGHT/ SUNLOAD HVAC SENSOR CONTROL (CENTER MODULE OF DASH) BATT POS VOLT BCM 3 FUSE BCM 6 FUSE BLK WIRE BODY CONTROL MODULE (BCM) (LEFT SIDE OF DASH) BRN/LT GRN WIRE BRN/VIO WIRE BRN/WHT WIRE BRN/YEL WIRE COMPUTER DATA LINES SYSTEM DK BLU WIRE DRIVER DOOR LOCK SWITCH DRV DR LK SW LK SIG DRV DR LK SW UNLK SIG DRV DR LK UNLK CTRL GRN WIRE GRN/GRY WIRE GRY WIRE GRY/BLK WIRE GRY/LT GRN WIRE HDLP HI BEAM RLY CTRL HEADLIGHTS SYSTEM HOOD AJAR SW SIG HOOD AJAR SWITCH (FRONT OF ENGINE COMPT) HORN RLY CTRL HORNS SYSTEM HOT AT ALL TIMES HYBRID POWERTRAIN CONTROL MODULE STARTER/GENERATOR CONTROL MODULE HYBRID/EV BATTERY PACK (HYBRID) (RIGHT SIDE OF LUGGAGE COMPT) INSTRUMENT PANEL FUSE BLOCK (LOWER LEFT SIDE OF DASH) LK MTR STATUS SIG LR LK MTR STATUS SIG RR LOCK CTRL LOCK CTRL 2 LOCK RELAY CTRL LT GRN/YEL WIRE NETWORK BUS 4 PASS DR UN LK LTCH CTRL PASSENGER DOOR LOCK SWITCH POS VOLT PPL RCDLR DATA GND RCDLR DATA RECEIVE RCDLR DATA TRANSMIT RCDLR POWER RED/WHT WIRE RIGHT REAR WINDOW SWITCH RUN/CRANK IGN 1 VOLT SECURITY IND CTRL UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY) VIO/BLK WIRE VIO/GRY WIRE VIO/YEL WIRE YEL WIRE

BLK WIRE BLK/WHT WIRE BRN WIRE CENTER HIGH MOUNTED STOP LAMP DOME LAMP SWITCH EXTERIOR REAR COMPARTMENT LID UNLATCH SWITCH INTERIOR REAR COMPARTMENT LID UNLATCH SWITCH LEFT FRONT DOME/ READING LAMPS LEFT LICENSE PLATE LAMP LEFT SUNSHADE LEFT SUNSHADE MIRROR LAMP LEFT TAIL LAMP ASSEMBLY LEFT TAILLAMP ASSEMBLY LOGIC PARK BRAKE CONTROL MODULE PASSENGER AIR BAG DISABLED INDICATOR REAR COMPARTMENT COURTESY LAMP REAR COMPARTMENT LID LATCH REAR DOME/ READING LAMP RIGHT BACKUP LAMP RIGHT FRONT DOME/ READING LAMPS RIGHT LICENSE PLATE LAMP RIGHT REAR TURN SIGNAL LAMP RIGHT SUNSHADE RIGHT SUNSHADE MIRROR LAMP SENSOR VIO/WHT WIRE W/ REMOTE W/O REMOTE KEYLESS KEYLESS ENTRY ENTRY

1 2 NETWORK BUS 4 RR DOOR AJAR SW SIG 2 1 LR DOOR AJAR SW SIG NETWORK BUS 2500 2501 1492 7684 COMPUTER DATA LINES SYSTEM 4 6 NETWORK BUS 3 RF DOOR AJAR SW SIG 6 4 LF DOOR AJAR SW SIG NETWORK BUS 4 9 5 NETWORK BUS 2 BLK WIRE BLU WIRE BLU/BLK WIRE BLU/VIO WIRE BODY CONTROL MODULE (LEFT SIDE OF DASH) BRAKE FLUID LEVEL SWITCH (ON BRAKE FLUID RESERVOIR) BRN WIRE COMPUTER DATA LINES SYSTEM COMPUTER DATA LINES SYSTEM 5986 333 DRIVER DOOR LATCH ASSEMBLY DRIVER WINDOW MOTOR (DRIVER'S DOOR) ELECTRONIC BRAKE CONTROL MODULE (LEFT SIDE OF ENGINE COMPT) GRN WIRE GRN/BLU WIRE GRN/GRY WIRE GRN/YEL WIRE GRY WIRE GRY/RED WIRE GRY/VIO WIRE LEFT REAR DOOR LATCH ASSEMBLY LEFT REAR WINDOW SWITCH LIFT GATE AJAR SW SIG 1 LOGIC NETWORK BUS 2 PARK BRAKE CONTROL SWITCH PARK BRK RELEASE SW SIG PARK BRK SW SIG PARKING BRAKE CONTROL MODULE (BEHIND LEFT REAR WHEEL LINER) PASSENGER DOOR LATCH ASSEMBLY PASSENGER WINDOW MOTOR (FRONT PASSENGER'S DOOR) POWER DISTRIBUTION SYSTEM PRESS BRAKE REAR COMPARTMENT LID LATCH (IN TRUNK LID) RED/WHT WIRE RIGHT REAR DOOR LATCH ASSEMBLY RIGHT REAR WINDOW SWITCH RLY COIL CTRL SERIAL DATA BRK FLUID LVL TRANSMISSION SHIFT LEVER POSITION INDICATOR VIO WIRE VIO/GRY WIRE VOL REF PARK BRK SW SIG WHT WIRE WHT/BLU WIRE YEL WIRE YEL/RED WIRE

22 1 SERIAL DATA BATT POS VOLT AIR BAG COIL AUTO BCM 3 FUSE BLK WIRE BLK/DK BLU WIRE BODY CONTROL MODULE (LEFT SIDE OF DASH) CENTER CONSOLE MULTI-FUNCTION SWITCH COMPUTER DATA LINES SYSTEM CRUISE CONTROL, SOUND SYSTEMS DIMMER SWITCH DK BLU WIRE DOME LAMP SWITCH DRIVER DOOR LOCK SWITCH DRIVER SEAT MEMORY SWITCH (W/ MEMORY) FOG LAMP SWITCH GARAGE DOOR OPENER SUNROOF SUNSHADE GRN WIRE HDLP SW PARK LP SIG HEAD HEAD-UP DISPLAY SWITCH (IF EQUIPPED) HEADLAMP SWITCH HORN SWITCH HOT AT ALL TIMES IGNITION MODE SWITCH (W/ KEYLESS ENGINE INSTRUMENT CLUSTER INSTRUMENT PANEL FUSE BLOCK (LOWER LEFT SIDE OF DASH) LED BACK LEFT FRONT DOME/ READING LAMPS LEFT STEERING WHEEL CONTROLS SWITCH LEFT TAILLAMP ASSEMBLY LIGHT CTRL SW REF LIGHT CTRL SW SIG LIGHT DIMMING CONTROL LOW REF LT GRN WIRE OFF ORG/VIO WIRE OUTSIDE REARVIEW MIRROR SWITCH (W/O MEMORY) PARK PARKING ASSIST ON/ OFF SWITCH (W/ REAR PARKING ASSIST) PARKING BRAKE CONTROL SWITCH (BEHIND LEFT REAR WHEEL LINER) PASSENGER DOOR LOCK SWITCH PASSENGER WINDOW SWITCH PNK WIRE REAR DOME READING LAMPS REAR WINDOW SUNSHADE SWITCH (IF EQUIPPED) RED/WHT WIRE RIGHT FRONT DOME/ READING LAMPS RIGHT STEERING WHEEL CONTROLS SWITCH SEAT MEMORY CONTROL MODULE (W/ MEMORY) (UNDER DRIVER'S SEAT) SERIAL DATA LOGIC STEERING WHEEL) SUNROOF SWITCH (IF EQUIPPED) SWITCH VIO WIRE W/ MEMORY W/O MEMORY YEL WIRE YEL/BLK WIRE

AUXILIARY AUDIO INPUT BATT + BDY RC IGN FUSE BLK WIRE BLK/GRY WIRE BLK/YEL WIRE BLU WIRE BRN WIRE BUS 10 NETWORK BUS 5 NETWORK CAMERA SHIELD CAMERA SIG (-) CAMERA SIG 2 COAX COMPUTER DATA LINES SYSTEM DISPLAY DISPLAY SIG + EXTENSION GMLAN LOW SPD GRN WIRE GRN/BLU WIRE GRN/WHT WIRE GROUND GRY WIRE GRY/VIO WIRE GRY/YEL WIRE HOT W/ IGNITION RELAY ENERGIZED HUMAN MACHINE INTERFACE CONTROL MODULE IGN 1 VOLT INFO DISPLAY MODULE LOGIC LOW REF MOST CTRL NAVIGATION NAVIGATION DISPLAY SIG NCA WIRE NETWORK BUS 5 RADIO CONTROLS REARVIEW CAMERA RED WIRE RED/BLU WIRE RED/VIO WIRE SERIAL DATA SERIAL DATA (-) (1) SPLY VOLT UNDERHOOD FUSE BLOCK (LEFT SIDE OF BATTERY) USB VIO WIRE VIO/BLK WIRE VOICE AUD SIG WHT WIRE WHT/BLU WIRE WHT/GRN WIRE WHT/VIO WIRE YEL WIRE

3 2 1 FAN SPD SIG 1 FAN SPD SIG 2 GROUND 5 4 BATT POS VOLT FAN SPD SNSR SUPPLY VOLT ACCESSORY WAKEUP AJAR SW SIG AUXILIARY/ ELECTRIC TRANSMISSION FLUID PUMP BATT POS VOLT BATT RVC FUSE BATTERY ENERGY CONTROL MODULE BLK WIRE BLK/BRN WIRE BLK/VIO WIRE BLK/YEL WIRE BLU WIRE BLU/BLK WIRE BLU/VIO WIRE BPIM BATT FUSE BPIM IGN FUSE BRN/LT GRN WIRE BRN/WHT WIRE COMPUTER DATA LINES SYSTEM COOLANT TEMP SNSR SIG SNSR LOW REFERENCE CURRENT SNSR LOW CURRENT SNSR SIG CURRENT SNSR SPLY DK BLU WIRE DK BLU/GRY WIRE FAN SPEED SNSR SUPPLY VOLT BATT POSITIVE VOLTAGE SERIAL DATA (+) SERIAL DATA (+) FROM HYBRID/ EV BATTERY SECTION 2 (DIAGRAM 4 OF 4) GRN WIRE GRY WIRE GRY/VIO WIRE GRY/YEL WIRE HIGH SER DATA HOT AT ALL TIMES HOT W/ ENGINE CONTROLS IGNITION RELAY ENERGIZED HOT W/ IGNITION MAIN RELAY ENERGIZED HYBRID/EV BATTERY PACK (RIGHT SIDE OF LUGGAGE COMPT) HYBRID/EV BATTERY PACK CABLE COVER HYBRID/EV BATTERY PACK CURRENT SENSOR HYBRID/EV POWERTRAIN CONTROL MODULE STARTER/GENERATOR CONTROL MODULE LOGIC HYBRID/EV BATTERY PACK COOLING FAN LOW SER DATA LT GRN/VIO WIRE LT GRN/WHT WIRE MAIN CONTACTOR MGU CLT PMP FUSE NCA WIRE ORG/ WIRE P-P BLOWER FUSE PRE-CHARGE CONTACTOR RED WIRE RED/BLK WIRE RED/DK BLU WIRE RED/VIO WIRE RED/YEL WIRE REFERENCE RUN/CRANK IGN 1 SER DATA SERIAL DATA SERIAL DATA (+) SERIAL DATA (-) BATT POSITIVE VOLTAGE STARTER/ GENERATOR COOLANT PUMP RELAY STARTER/GENERAROR COOLANT TEMPERATURE SENSOR (RIGHT FRONT SIDE OF ENGINE COMPT) UNDERHOOD FUSE BLOCK VIO WIRE VIO/BLK WIRE VIO/WHT WIRE VIO/YEL WIRE WHT BLU/BLK WIRE WHT WIRE WHT/YEL WIRE YEL/GRN WIRE